# Chapter 1 - Introduction to Algebraic Expressions - 1.1 Introduction to Algebra - 1.1 Exercise Set - Page 11: 90

perimeter = $4s$

#### Work Step by Step

A square is a 4-sided figure where all 4 sides are equal in length. The perimeter of a square is the sum of the lengths of the sides. If the side of a square has a length of s the sum of the lengths of the 4 sides is then $s+s+s+s$ or $4s$.

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